GROWTH India. G.C. Anupama Indian Ins/tute of Astrophysics Bengaluru, India

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1 GROWTH India G.C. Anupama Indian Ins/tute of Astrophysics Bengaluru, India 1

2 Indian par0cipa0on Key science interests: EMGW, Young Supernovae, [Novae] ToO /me on op/cal telescopes (HCT, IGO) Monitoring /me on HCT for late phases DDT /me on GMRT New 0.7m telescope Poten/al Astrosat DDT requests 2 day response /me, ToO only in excep/onal circumstances 2

3 Indian Astronomical Observatory Digpa-ratsa Ri (Mt. Saraswati), Hanle n n n n n n n Location: 32d46m46s N; 78d57m51s E Altitude: 4500m (15000ft) ~260 clear nights/yr (~190 photometric); Median seeing ~1 arcsec 2m Optical/NIR telescope The Himalayan Chandra Telescope (HCT) High altitude Gamma Ray Array Telescope (HAGAR) Aluminizing facility, LN2 plant Observatory powered by solar power A GREEN OBSERVATORY (with backup diesel generators) 3

4 Himalayan Chandra Telescope l 2m aperture f/1.75 primary; f/9 Cassegrain l Telescope first light in August 2000, remote opera/on in January 2001 l Telescope and instruments tes/ng and commissioning 2001 September 2003 April l In regular use since May 2003 l Telescope, Dome and Instruments Controlled remotely using a dedicated satellite link from IIA's CREST campus at Hoskote, Bengaluru 4

5 HCT Instruments l l l l Instruments mounted on a cube with 4 side ports and one on-axis port Hanle Faint Object Spectrograph Camera (HFOSC) nm range Imaging and low-medium resolution spectroscopy TIFR Near-Infrared Spectrometer Camera (TIRSPEC) 0.9-1micron range. Imaging and low-medium resolution spectrosocopy Hanle Echelle Spectrometer (HESP) nm range. High resolution spectroscopy (R~30000; 60000) 5

6 Indian Astronomical Observatory, Hanle, Ladakh Observatory Gamma-ray Array Telescope (HAGAR) Base Camp of IAO Remote Operation from Bangalore 6

7 Examples of HCT Follow up 7

8 Transients with IGO and HCT Successful exis/ng collabora/on Discovery iptf, California Monitoring Varun Bhalerao, IUCAA Follow- up Anupama & Sahu, IIA/ Hanle Publica/ons Kasliwal, M.M., Sahu, D.K., Anupama, G.C. 2009, CBET 1874, 2 Kasliwal, M.M., Sahu, D.K., Anupama, G.C. 2009, CBET 2117, 1 Singer, L et al, 2015, ApJ, 806, 52 Bhalerao, V., & Sahu, D. K. 2014, GCN, Bhalerao, V., Singer, L. P., Kasliwal, M. M., et al. 2014, GCN, Singer, L. P., Kasliwal, M. M., Bhalerao, V. B., et al. 2014b, GCN, Hsiao, E.Y. et al. 2015, A&A, 578, A9 8

9 Supernova Monitoring - HCT iptf13bvn type Ib [Srivastav et al. 2014, MNRAS, 443, 1663] First spectrum - 13 days Photometry ~80 days Spectroscopy ~40 days Fast declining, low luminosity type Ib Binary progenitor [Bersten et al. 2014, Srivastav et al. 2014] 9

10 Supernova Monitoring - HCT iptf13ebh and SN 2015bp transi/onal type Ia [Hsiao, E.Y. et al. 2015, A&A, 578, A9; Srivastav et al. submijed] First spectrum - iptf13ebh: - 11 days; SN 2015bp: - 4 days Both SNe are low luminosity events, with lower than normal veloci/es that have a rapid velocity evolu/on along with fast declining light curves (designated as FAINT class by Benek et al. 2005) 10

11 Supernova Monitoring - HCT SN 2014ad Broad lined Type Ic Follow up - - 5d to +87d (photometry and spectroscopy) Early velocity ~33,000 km/s Luminosity higher than non- GRB BL Ic Detec/on of Helium responsible for absence of GRB [prevents emergence of jets?] Sahu et al. ApJ, submijed 11

12 IIA Supernova Team Devendra Sahu Assoc. Prof. [SNe, GRB] Shubham Srivastav PhD Student final year [Hydrogen deficient SNe Ia, Ib/c] Avinash Singh PhD Student [Core collapse SNe] 12

13 GROWTH India - Funding Project approved by the Science and Engineering Research Board of the Department of Science and Technology, Government of India (DST- SERB) Rs. 38 million (about 560k USD) Covers: New telescope and camera PI visits (eg GCA) Extended graduate student visits (Javed Rana) 13

14 0.7m Telescope Sited at IAO, Hanle exis/ng dome 1 deg FOV; Photometry Will be India s first fully robo2c telescope 30% /me available for other ac/vites Astrosat, LIGO- India, LSST (IUCAA partner) Non- ToO: Blazar and AGN monitoring Frees up /me on other telescopes Useful for other projects aser GROWTH 14

15 0.7m - Current status Telescope and camera tender call Final bid date 25 July, finalize by mid August Remote control and autonomous sosware Development by IUCAA and IISER Pune students At mature development stage Image processing exper/se at IIA 15

16 Telescope Automa/on 16

17 Remote Telescope Control We have developed a client- server model for sending triggers to telescopes Built in python, relies on open source RTS2 package Client sits at telescope, makes only outgoing hjp connec/ons to server No firewall / VPN issues Server coordinates targets, gives status reports etc 17

18 GROWTH Telescope Architecture Observatory site Telescope, Camera, Dome, etc (RTS2 or direct) Control center Manual target entry GCN interface (Tiling routines for large regions) Client Commands Polling queries Server User Image storage Image processing Target DB Telescope status Observation status 18

19 System advantages Highly modular, easy to adapt to any other telescope Adapted as test case to DOFT, a 1.3m telescope in Devasthal, India Atharva Pa/l (GROWTH undergraduate intern) is using the same sosware for automa/ng the Lulin 1- m telescope (LOT) with Chow- Choong Ngeow 19

20 Server: Current basic interface Development team: all students! Sujay Mate Sumeet Kulkarni Atharva Patil Siddharth Maharana 20

21 Op/mal Scheduling If ToO requires imaging large areas, how best to select and sequence the images? Work by Javed Rana, Varun Bhalerao et al Adapted to iptf scheduler (with help from Leo Singer) For more details, see Javed Rana s talk 21

22 ACKNOWLEDGEMENTS GROWTH- India is funded by the Science and Engineering Research Board (SERB), supported under the Partnerships for Interna0onal Research and Educa0on (PIRE) Program and administered through the Indo- US Science & Technology Forum (IUSSTF). 22